Pictures and circuits of my DIY class D and other projects.

[RX5]

thanks... 🙂

nyways, MeRrY X-MaS & HapPy NeW YeAr!!

 

[classd_fromru]

hi all!
luka,

thanks 🙂

rogs,

I tried to short cicuit output. OCP protection works. After a delay all will start normally. For test i use supply voltage +-25v and 100v mosfets.

I have tried to measure parameters of a sound card in Spectralab (direct output to input). And it have only 81db 🙁 SNR and THD=0.008% (SB Live 5.1). Parameters of the amplifier I shall try to measure today.

 

[luka]

Hi,

Can you post or send me or put on your web very large picture of SMD side of UcD2.5, pls

 

[classd_fromru]

luka,

I shall send a photo later, when I come to home.

 

[luka]

Thanks

I saw that some values of C are missing, but that was probably intencional, right?
What is switching freq. of the amp?

 

[classd_fromru]

luka,
Some ceramic shunting capacitors in supply lines are not shown on the circuit.

Values can will change in dependence it supply voltage.

Fosc=300-330k

 

[classd_fromru]

Measurements of sound card:

 

[classd_fromru]

Measurements of 2.5 amp with IRFB23N15D and supply voltage +-21v. RMS power=10w f=1khz

On 1-2w distortion is about 0.025%

 

[edl]

Hi,

Thanks for the graphs!

And how much distortion did you measure at full power? At about 500W-RMS? (+/-75V supply)

I'm going to build an UCD-2.5 by your design, but with non-SMD components.

 

[classd_fromru]

edl,

I have only 27W small transformer, i need to build a high power SMPS or buy new big transformer for measure at high power.

+-75 its absolute maximum voltage i dont recomend this. Best use about +-60-65v.

 

[luka]

Thanks for pictures

How low do you think you can go with supply, for amp still to work?

 

[classd_fromru]

luka,

It working with supply voltage about +-12v!

 

[luka]

What is the core name/size?

 

[classd_fromru]

luka, Epcos RM10 N87

 

[edl]

OK, then I'm going to test the UCD-2.5 with 50-55V when I'm finished with building the module.
(Then it will gives about 250W RMS power on 4 ohm.)

 

[luka]

Same here, maybe up to 400 but I don't know driving what 🙂

 

[edl]

Maybe I will try with my 2*50V 1000VA toroidal transformer. That gives +/-70V DC supply.
Enough for 2*450W-RMS (4 ohm).

 

[classd_fromru]

Those who will do my project 🙂 ,
Necessarily post your results and photos of pcbs here, it is very interesting for me!

 

[edl]

Of course, I will!

And thanks for the schematics!

 

[Soundmaker]

And for me!!!.....